The complete collection of letters between Rupert Brooke and James Strachey was acquired by the Berg Collection of the New York Public Library in 1967 from Alix Strachey, widow of James Strachey. The letters cover the period of 1887 - 1915, there are a small number from Rupert Brooke to James's brother Lytton Strachey.

A dissertation by Keith Hale (1994) at Purdue University covers the letters of Rupert Brooke/James Strachey.